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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69f70b9b73cf10ab6ef01e245d78a587944cab9b3a1bf76c7f8b9f3151df201c' 
  AND token = 'LO6OSS4G+Ogg3PzpDZM+jTth1pOcl3ft1xSV+Va7Cc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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