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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3bdc7a2fd88afa9d4a7c4c8c2b9b632057206a9819ec1a48f2e7fced119bb74' 
  AND token = 'MNOu47T2OGylwN7YzpD/zelEMDeX1rp6+/8djoctp5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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