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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d6f9217bfbde68157aeecfeed224fb2c108e6ff53fe82778a181a6ce911d772' 
  AND token = 'aA4gbLFRQLs96H88pxlylFm9lcTn2ariX8piBl9HWIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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