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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9255d8f7f7e2a4add51e00a68ce57745ca17a30f7ea68a85f5727b8990222d75' 
  AND token = '1rkiMqNPf9OkNJPJsD4Jv1NPbACb6vvW02QpjHHhQoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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