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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb082a72bf3ce386d38c8801fcd820c481018e8148ba910f67c6bc1a9eed0ce1' 
  AND token = 'vsGu9yhkejF0Wgt/wICawhgUHQezmkfo1vkzd/hIB7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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