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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eae886c5d855bda7262daf0f7e5d67d6acb6eb2e38c2308e86dee84ea82a989c' 
  AND token = 'Zeah13lDuWV7w6k7r2mfITSwPtEfrPsT+S1G18LAaeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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