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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35733e43adda8bd48fff2f013e90c1036f98713a775a3ff6ca81fba265cb6e30' 
  AND token = 'orxT5bb1/J8oUH7nykd499Zjy6f3lkwcq1lduNJvPmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}