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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '341aa80545be2968d7cb417fe3a4611552e2b47ef84f013931255add67633bbc' 
  AND token = 'UUiNobfOJpCu+7BoiphjT8RAWYj+os4e8LhW06Y2GFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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