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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd5e580cb644e3038e13d271e13ac63f3c8ea54cea9093bdbea59ff76c6825c0' 
  AND token = 'sAkwsn5MsL1U33OSF6CfGkll6if/KdDsaHzteDe13rY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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