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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b52dbcf67ace5c1768483fe6fc3579e237fc42a7ac71009516e35713d41b5874' 
  AND token = 'YtZR6HPKa1fDTpvJ5rt1ol/PhQo+GTEvWoyN7hFY69g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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