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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c45c9b0c19cf723876458a10ebd4332f151cbc8e1cd1bd78a6ce32830256fcd9' 
  AND token = 'HrVlDMwzxtMNlVlx5TREsrOvRpjU86Me96gItixDUWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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