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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a51c132edae8a9f5fdb3f2ccfad9fcad9ce08e58765767fe6df7dd1edd421468' 
  AND token = 'LhXuq8c1bIZxNJR3zaM4l6kmb66m6bKy1bfahrOxe3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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