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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14b560f43c1e7b0978ab0855b28d8fde179775a080919be52ecf1c81c5c4b33b' 
  AND token = 'PqEnRB/8EXjpzmLobppSF01MGp8ftDOArSbFc+mGb3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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