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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f97cf6b203de4084f81a9b153b289a6c221adc3eec4a9d23d9f6b03f3657d86' 
  AND token = 'S/Nb0zRmnbwaoUR4K3WxB40c6pWAQrJL5QP9ncqwS7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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