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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b634d4c1997d3665a5491658e118757bae0941dd0f11c5d605f21e31cf5dc96' 
  AND token = 'hJAc5xZE3CU9g50iTWq0NggywtPLfRouFq6WB2S7yDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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