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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a9d02d6e9a51771fc4e785976ebb9df8e11a862ecba410c97ef50a64c8c28d9' 
  AND token = 'F7wcC429BCmvzi45R335IXm3GO5nq3Vi627mnuq1KBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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