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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1135ff7ad59e7b80f1e9ce183645dd668b3940c7ef950b91119c68c65d61cea' 
  AND token = 'zgUV6RQhuy+teOCVQfQWb8xTvGDTgOD5fEh5GI6cKK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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