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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8985251fec83d19a4b2bf090438ef7f4671c45253a88692b9ff1f0ca4a77df2' 
  AND token = 'vcuozc4lIFX9NxEK/1gM6Df6za1jgg/Ll4LtZ3L+sx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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