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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ad5dec6de1156a779424b307bbbaad8772b1bcef67af63fc77708b1976f31fc' 
  AND token = 'dpJHt5pmGWzZUWdj2C/m3zCah4cLzkvmVaDv6dE01fI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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