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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cee2cb0bb5606a2b1613a745a27e39d6b94b72ce8f43eb26832ebe0b50a02fd4' 
  AND token = 'yD6qjn918MBK0lsHLga+eVa2G43LVwsOS1elGMhho4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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