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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d4f1a3dcecd9df3d2324b2d7d95355f8960dfb343dc55914fa2da1f474ec98e' 
  AND token = 'fm7ZKCephNDlOcOKPw3l04dj2vtBStggUrJ9b81hbqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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