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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faf169638319c43af13cef06d61d0a7aa02d5bc792d73db4abb61bef7fbd3921' 
  AND token = 'XcvfHyvMQe5OGx4DC2y5Otp+WSR6syNs8V/nVSQQyuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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