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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ca86208ee18a4d8d88fef34d4dff27d81c2cf83449d21258ce3eaf083ee9f4a' 
  AND token = '3GGgGoxO2Jwdw4iN/yJYQ3r3glKRr1XdNsczjgvn8+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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