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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57f07352483e7c5e4f00b86906caa17ce9d5c3653265cb8e5c850a809ef7a7dd' 
  AND token = 'AENd6/XwIfXc9m7Ms+BFhjXAaAcmS1gj416UCE9GcZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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