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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85272e0c74165c21ade88568bae7b851ae6657ba6c325bd0477c0341a388af21' 
  AND token = '0+UzQZm0uF7rZUvbUBykRpWQt8Gbb7s2x27flzAPsaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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