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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42e775e3e6471753b288c5dbf1d730b23485b948a4ba3144dfa288a03be169c3' 
  AND token = 'Krks631X0seJ3J8OSQb3tensGIgwudK+f6xmt/vhgjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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