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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e624cad3832418d0dd60c8fb0beac7a90b4d1f30532686f692c7fbedf255c0e' 
  AND token = 'V0cknX8Ew/yYbV3TTcDgafIyPH9qPIWDkEzdWvM0W8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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