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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '799a10e4914206b8a870a271d0f631e83413a11cc481c96ea886f589e6ac6c03' 
  AND token = 'L5TgiwrqTvTUZ8D/cCQyx+PpMD8aw6mKurdrE+Sv1yM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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