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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b07601c855c03da22a628b500249e7f27e97254bc019a645e7fd9a5fd2ba7143' 
  AND token = 'n7Is9qmvHSfuLvNOsQXuEx1jZHD95vHqjXkuMjJCoZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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