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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b747f7264e4f7ea27e93a289ad23bfbb5f2ed690b49f68b47533030585fa66f0' 
  AND token = 'oakNy0lqgB6ndq+VGg3mHnFs3j6xCsdAO8rESFePUr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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