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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02948dc718da61cf73a3d865d75c97ace7d4dba52c6870b6b73934309c061148' 
  AND token = 'KwyyAi0BgOCWLxafiD1FJEOX591+4IDhIGfziL0d1d8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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