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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04fe46e409d7b0bb59cde6020719af10cac7c38e084bbd9acdb9bc9a90ca81a7' 
  AND token = 'hNpHOcKeP8APb7yAjyyX76HJ+eQOliTisXI7Gm0vAk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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