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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e8704a59ea1cd41463d3f0e05c09cb937ea233aec77535f8d63518a1152f6f3' 
  AND token = '4pupfY0zM6lSYQmWGHFWEUzLen9tsp4VKVkHuC58W6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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