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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c04b7b7d76eae3ec844528a9c77e26967a7edd7b9d53d2e924b985d2b83d1cf4' 
  AND token = 'GCz4wPL2f4fvF3T1AFSuojIb2ZPln7DlOn/dd9d0WGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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