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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dad34dcb6381e08867699d5700515d8f2ed0e4ba9872ca53dfc8e386a27adb73' 
  AND token = 'QL1FHbpPHdNXfcVu/0E/Jv90/A7QiaNQdssBRKx9Tpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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