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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14573eae71885cb10384d917333ef7ce72c04d6ba9110b13182aa8ecc7f8da9f' 
  AND token = '6ZEQIZ4SdxtyIZiWpHYb0VAGZJ6t/XFml0pvj304Cm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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