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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0464289b5eec8716450e10a970a4be3f822299d43fc83fcacfc251f275404679' 
  AND token = 'AEweZplQkVgnuNRhGwbUWjKOatAMouyF8ZcCZzNOMf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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