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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '755668c8124945d2808a061d68b257946168a599206066576e794ab613b75d29' 
  AND token = 'yN9na9tu5vjO2Z+P4Ol9R/2K8kDrzbKBF8IAwV/oi+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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