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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '664900d3b25ee412d73e578a0c35fbadf1d8b52d5fd95204f17d048e1bf0f268' 
  AND token = '3frE7mMmyqSwxM/quunG8veE3tx4NGtDcHypoyaX3fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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