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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bed210211c440ef2c31f29decaa82d262abb0f9e6dec1af71c96936cb91a53af' 
  AND token = 'oMBYiMwMjZ4EYLuOo7wdjEFZ+mG3QSnXATpvsh2EY8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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