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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fea3599fd7bcf1378b2ef080ca8a5e2ca4bb2921b5bec6c1c4c5cc2650560f9' 
  AND token = 'vBCnPcQbSzF6DBcHVpTtp/6/M5lo3T+WKvuSn5QcE34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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