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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53feacfa0ad9739501a03218322808d5b95ac618a7020d9d6b465848a88d8f6c' 
  AND token = '/OpDm+gSoFfAIznKhTVc/v2su04REfASeX/OUrEtKYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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