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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a73904f1a9b9cd33a36f7c3a46e39833294dad4d16320e8fa2c2ce91edb5eb7c' 
  AND token = 'vZD7cRZy0OXZ27UKrG9O3jqXrhA0bHS06F2m80B6FwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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