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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a844c49a83b6ddbbcfa0ea471a964da32afeefaec1eb4cdc3a7f3b94d19beeeb' 
  AND token = '/ObW0JCys9p3hIFcZr31NVKVP3lEBexYBWcr9InaTgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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