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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b96dffcaf782246b20a10be9133cf73b1f4697c32858d62bc1675a6403591d1f' 
  AND token = 'CqLosQSMxAiOIt4Su4pCfNZEwW5Ds429U1Xrerh3+Dw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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