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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4ae75e94523737a01a0f8566035bdbb81054c87e4dc0e997d970727e6df9aa2' 
  AND token = 'hEFnely1N7+D+E/9Mguk5D8OaxCSnFb2g26rVPled+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00134

JSON explain

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