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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c36c35fdf1e33f63b42e4a6c70ec55b62905c3a699eb6737a4aed8188f520367' 
  AND token = 'c0vMAxwwpcLvf9Fi5yCbSxw3+s3vWKkxKP4PtL7kGRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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