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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '184c6ebe529644d563a6e389f7b547e97bb155e43ac2ce7fbc67cb4d701cbfc4' 
  AND token = '8+ag65HDWEft3+2vT2qFxGK+/5TKajrhT1c8vcjb2bY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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