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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b4363b9392acf56473058ef53b842820c632ee0662b92a10a6655c2ce460b32' 
  AND token = '6PT+s879Yt43tEFI1S+h7PYSICdvAiGJke6ZL2bduiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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