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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcecd9721f90b9b36f85436cb644a53e09cf18a6bd4f1a86fc3ce643db2556c1' 
  AND token = 'hFn0k1MvzC/sHcU0ipgxM9kgkxEBz7p0WdJE8lH4oFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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