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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c00d315c1d680e08c9a686f117749568f075487ceb24145eeb828b58a0ed4294' 
  AND token = 'VPDNBCvt7K8BdDljL614KYw43gazWO5Ls97I7qHEI5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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