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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b2283ae26d7bd1551635d6ec6c4b46efa764b8aa0f2d9aaea08bf60d63f596e' 
  AND token = 'V3qhA2s85R8xyK8JxjnQIwbHXyF4OaYwNzYS841iiQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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