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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf3cb30f39beb0fef5fcb85a4d98d2889049d0b6c3270d0e39abaf81865ce21e' 
  AND token = 'fyDAwadUIo2+BYvUR7fG8zbJNn0r9YQOH8D6rbpj+NI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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