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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '003f443367888fc61bb15870fd3d40ee55bcd61724ee60aa6e8c21ce6b381c79' 
  AND token = 'BjSMyPaeH9ktVfvYWIEeI4DfZIMm02hVRitYnU62Cqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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