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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1833d4cf54c923f21f6946e31904dc970df993a5584891bff5c9dd6edf3bbf67' 
  AND token = '1yOX4GM3QGgCUrfOm4R7kx6ZGRUX1mQczbT4781M5xM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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