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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '160c8b8dc55bbe8fe0dd297a84b45fb0e6dc0cc515a4d7eb6a7f5b8f35465472' 
  AND token = 'pkztFeEqiqNwKnl8eGWs+arImAZ5El7lHIjfbG18Zl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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