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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc97a1646044b9473f72351baaae0ee7f75d1b87ffe1b2af4484eb41cb3d07c6' 
  AND token = 'ctHVzSEv+bBkf/Dtpz4wP2+qKz0hMcIdimx3fwvlTSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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