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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '033ae2614dde404e6d7fa6c1261c0408639070006859cf4f141998a8b87b5394' 
  AND token = 'b88KwbAawGIKu2cGjEbR77W0RFXvTbac3/C8C4k/V7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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