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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fd8cc7e2ba28d752d74ecc4bfd881e2b5f765ec16940ff438522b64b6eb5fd6' 
  AND token = 'FQjzQrLcVyf+oiJ0RFzptCu/U3L8KOa8CrOOF2IUKLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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