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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43c8a44eaec31884aae95ad4894f6f58046b08ebb27df68b25ca890984dec7e4' 
  AND token = 'HOpFHCl0omp2cBOIjX/IqRqLKz8t8Jqo5+9d8a8GGT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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