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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a425ae34c11b989f3e6b5c632eb0f61f07599bc3b2d6f3699106e01112fbdf73' 
  AND token = 'mNALw2MBg4J0aoPdRM0hmdq46UOugL7IAKCxZ6pdYnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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