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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fa504529ad0c12be6c723bb149bfe6c1fd4dffe6af9e0930fdaf647d1118183' 
  AND token = 'oT4k0dl3brwH9AwIxvPNUTrHJ1jB4knNINsTm7/bPYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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