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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd949e4ff56efabe19efeb688c700563564c1928737f45d21af3a5ff8f818b0c7' 
  AND token = 'OcMYXgkQmOiS9b/RRYx/xGeR59GIg6Es1x5R7rHeb/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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